CVE-2021-43203 Auth bypass in n/a

What is CVE-2021-43203?

CVE-2021-43203 is a high-severity authentication bypass vulnerability in n/a, published on 9 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.

Weakness: CWE-287

Which versions are affected by CVE-2021-43203?

It affects 1 product.

Products include Jetbrains Ktor.

How do I fix CVE-2021-43203?

No fix has been published for CVE-2021-43203 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2021-43203 being exploited?

There is no known exploitation of CVE-2021-43203 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2019-12736 Command injection in n/a Critical 9.8
• CVE-2022-29930 SHA1 implementation in JetBrains Ktor Native 2.0.0 was returning the same value. High 8.7
• CVE-2023-45612 XML external entity in Ktor High 8.6
• CVE-2022-48476 Path traversal in Ktor High 7.5
• CVE-2023-45613 Security feature bypass in Ktor Medium 6.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-p34x-8gxh-mj58.